Battery device, energy storage device, energy storage system and charging network

Abstract

The embodiment of the utility model provides a battery device, an energy storage device, an energy storage system and a charging network, and belongs to the technical field of battery devices. The battery device comprises a battery monomer group, wherein the battery monomer group comprises a plurality of battery monomers arranged along a first direction; the supporting beam is arranged on one side of the battery monomer group along the second direction; wherein a pressure relief mechanism is arranged on one side, facing the supporting beam, of each battery monomer, a first collecting cavity and a liquid collecting cavity are formed in the supporting beam, the first collecting cavity and the liquid collecting cavity are arranged at intervals in a third direction, and the third direction, the second direction and the first direction intersect in pairs; the third direction is parallel to the height direction of the battery device, and the first collecting cavity is positioned above the liquid collecting cavity; the first collecting cavity is used for collecting emissions of the battery monomers when the pressure relief mechanism is actuated; and the liquid collecting cavity is communicated with the first collecting cavity and is used for collecting liquid in the discharged substances, so that the possibility of short circuit caused by contact between the pressure relief mechanism and the liquid can be reduced, and the reliability of the battery device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery device, in particular to a battery device, an energy storage device, an energy storage system and a charging network. BACKGROUND

[0002] With the rapid development of science and technology, electric energy has become an indispensable energy in people's production and life. In order to improve the smoothness of electric energy supply and realize the normal operation of production and life, energy storage devices need to be used. Energy storage devices can realize the cyclic storage and release of electric energy. By charging or discharging the battery device of the energy storage device, electric energy can be stored in the energy storage device, or the electric energy stored in the energy storage device can be supplied to the electric device. Energy storage devices are widely used in industrial power supply, household power supply, temporary power supply, mobile power supply, wind power generation, solar power generation and energy storage power station fields.

[0003] In the development of energy storage devices, in addition to improving the endurance performance of energy storage devices, how to improve the reliability of battery devices is also a problem that cannot be ignored. Therefore, how to improve the reliability of battery devices is a continuous improvement technical problem in energy storage technology. CONTENT OF THE INVENTION

[0004] In view of the above problems, the present application provides a battery device, an energy storage device, an energy storage system and a charging network to reduce the possibility of liquid backflow in the exhaust, thereby improving the reliability of the battery device.

[0005] In a first aspect, the present application provides a battery device, comprising:

[0006] a battery cell group comprising a plurality of battery cells arranged along a first direction;

[0007] a support beam arranged on one side of the battery cell group along a second direction;

[0008] wherein one side of the battery cell facing the support beam is provided with a pressure relief mechanism, and the inside of the support beam is provided with a first collection cavity and a liquid collection cavity, the first collection cavity and the liquid collection cavity are arranged along a third direction, and the third direction, the second direction and the first direction intersect with each other;

[0009] The third direction is parallel to the height direction of the battery device, and the first collection cavity is located above the liquid collection cavity.

[0010] The first collection cavity is used to collect the exhaust of the battery cell when the pressure relief mechanism is actuated; the liquid collection cavity is in communication with the first collection cavity, and the liquid collection cavity is used to collect the liquid in the exhaust.

[0011] In the technical scheme of the embodiment of the present application, the liquid collection cavity capable of communicating with the first collection cavity is arranged in the interior of the support beam, the first collection cavity and the liquid collection cavity are arranged in a third direction parallel to the height direction of the battery device, and the first collection cavity is arranged above the liquid collection cavity, so that the liquid in the first collection cavity can flow downward under the action of gravity and enter the liquid collection cavity, the liquid in the discharge of the first collection cavity is collected by the liquid collection cavity, the phenomenon that the liquid in the first collection cavity flows back to the area where the battery monomer is located and contacts the pressure relief mechanism is reduced, the possibility that the pressure relief mechanism is short-circuited due to contact with the liquid is reduced, and the reliability of the battery device is improved.

[0012] In an optional embodiment, the interior of the support beam is provided with a partition plate, the first collection cavity and the liquid collection cavity are arranged on two sides of the partition plate respectively, the partition plate is provided with a liquid discharge hole, and the liquid collection cavity communicates with the first collection cavity through the liquid discharge hole.

[0013] By arranging the partition plate in the interior of the support beam, the interior cavity of the support beam can be separated into the first collection cavity and the liquid collection cavity by the partition plate. At the same time, the liquid discharge hole is arranged on the partition plate, the liquid discharge hole communicates with the first collection cavity, and the liquid in the first collection cavity can enter the liquid collection cavity.

[0014] In an optional embodiment, the extension direction of the liquid discharge hole is parallel to the third direction; and / or, the cross section of the liquid discharge hole perpendicular to the third direction is circular, and the diameter of the liquid discharge hole is not less than 10 mm.

[0015] By making the extension direction of the liquid discharge hole parallel to the third direction, the liquid can flow into the liquid collection cavity along the third direction, and at this time, the flow path of the liquid is the shortest. By making the diameter of the liquid discharge hole not less than 10 mm, the liquid can enter the liquid collection cavity quickly, and the influence of the small diameter of the liquid discharge hole on the flow rate of the liquid is avoided.

[0016] In an optional embodiment, a plurality of liquid discharge holes are arranged, and the plurality of liquid discharge holes are arranged in sequence and spaced apart along the first direction.

[0017] The distance between the centers of two adjacent liquid discharge holes is d1, the size of the battery monomer along the first direction is d2, and d1≤2×d2.

[0018] Since the distance d1 between the centers of two adjacent liquid discharge holes is not more than 2 times the size d2 of the battery monomer along the first direction, at least two liquid discharge holes are arranged between every three adjacent first battery monomers, the liquid can enter the liquid collection cavity quickly, and the influence of the small diameter of the liquid discharge hole on the flow rate of the liquid is avoided.

[0019] In an optional embodiment, a first vent hole communicating with the first collecting chamber is provided on a side of the support beam facing the battery cell, and the first vent hole corresponds to a position of the pressure relief mechanism;

[0020] In a first projection plane perpendicular to the second direction, the orthographic projection of the first vent hole covers the orthographic projection of the pressure relief mechanism.

[0021] By providing a first vent on the side of the support beam facing the battery cell, when the pressure relief mechanism is activated, the discharge from the battery cell can be discharged directly into the first collection chamber through the first vent. At the same time, because the orthographic projection of the first vent within the first projection plane covers the orthographic projection of the pressure relief mechanism within the first projection plane, on the one hand, the pressure relief mechanism is unobstructed, which facilitates the rapid opening of the pressure relief mechanism and prevents the pressure relief mechanism from being blocked by the support beam when activated, preventing it from being unable to open or fully open. This, in turn, prevents the battery cell from being unable to vent or venting smoothly when thermal runaway occurs, and prevents the internal pressure of the battery cell from being unable to be quickly released, causing the battery cell's outer shell to rupture or explode. On the other hand, it also prevents the metal structure of the pressure relief mechanism from contacting both the outer shell of the battery cell and the support beam simultaneously when the pressure relief mechanism is activated.

[0022] In an optional embodiment, the cross-sectional area of ​​the first collecting chamber perpendicular to the first direction is S1, the cross-sectional area of ​​the pressure relief mechanism perpendicular to the second direction is S3, and S1>2×S3.

[0023] By making the cross-sectional area S1 of the first collecting chamber larger than twice the cross-sectional area S3 of the pressure relief mechanism, emissions generated when the pressure relief mechanism experiences thermal runaway can be smoothly discharged into the first collecting chamber.

[0024] In an optional embodiment, the battery device further includes a box body, the box body includes two end plates spaced apart along the first direction, the support beam is connected between the two end plates, and the battery cell group is disposed between the two end plates;

[0025] At least one of the end plates is provided with a second collecting cavity and a second vent hole communicating with the second collecting cavity;

[0026] The first collecting chamber is communicated with the second collecting chamber through the second vent hole.

[0027] Since the first collecting chamber can be communicated with the second collecting chamber, the discharge of the battery cells can enter the second collecting chamber through the first collecting chamber and the second vent hole.

[0028] In an optional embodiment, a cross-sectional area of ​​the second vent hole perpendicular to the first direction is S2, a cross-sectional area of ​​the pressure relief mechanism perpendicular to the second direction is S3, and S2>2×S3.

[0029] By making the cross-sectional area S2 of the second vent hole larger than 2 times the cross-sectional area S3 of the pressure relief mechanism, the emissions in the first collection cavity can be smoothly discharged to the second collection cavity through the second vent hole.

[0030] In an optional embodiment, a partition plate is arranged in the second collection cavity, the partition plate is used to divide the second collection cavity into a first sub-cavity and a second sub-cavity, the first sub-cavity and the second sub-cavity are spaced apart along a third direction; the third direction, the second direction and the first direction are perpendicular to each other.

[0031] The first sub-cavity and the second sub-cavity are both communicated with the second vent hole.

[0032] Since the second collection cavity is provided with a partition plate, the inner cavity of the second collection cavity can be divided by the partition plate to form a first sub-cavity and a second sub-cavity spaced apart along a third direction, and the first sub-cavity and the second sub-cavity can both be communicated with the first collection cavity through the second vent hole. At this time, the liquid in the emissions in the first collection cavity can enter the lower one of the first sub-cavity and the second sub-cavity, realizing the discharge of the liquid from the first end plate.

[0033] In an optional embodiment, the first collection cavity has a first inner surface and a second inner surface arranged opposite along the third direction.

[0034] The partition plate is located between the first inner surface and the second inner surface along the third direction and is spaced apart from the first inner surface and the second inner surface.

[0035] Since the partition plate is located between the first inner surface and the second inner surface of the first collection cavity along the third direction, and the partition plate is spaced apart from the first inner surface and the second inner surface, at this time, the emissions in the first collection cavity can be smoothly discharged to the lower one of the first sub-cavity and the second sub-cavity through the second vent hole, reducing the blockage of the liquid flow by the partition plate.

[0036] In an optional embodiment, the box further comprises a bottom plate for bearing the battery monomer group, and a reinforcing member, the support beam and the two end plates are connected to the bottom plate.

[0037] The reinforcing member is connected between the two end plates, and the battery monomer group is limited between the reinforcing member and the bottom plate along the third direction.

[0038] The third direction, the second direction and the first direction are perpendicular to each other.

[0039] The bottom plate is arranged to support the installation of the support beam and the two end plates. Meanwhile, the reinforcing member is arranged to limit the battery monomer group along the third direction through the cooperation between the reinforcing member, the two end plates and the bottom plate, so as to reduce the possibility of the battery monomer coming out along the third direction, and to relieve the expansion force of the battery monomer while improving the structural strength of the box body.

[0040] In an optional embodiment, two battery monomer groups are arranged, and the two battery monomer groups are arranged on opposite sides of the support beam along the second direction. The side of the battery monomer of each battery monomer group facing the support beam is provided with a pressure relief mechanism, and the first collection cavity is used to collect the emissions of the corresponding battery monomer when each pressure relief mechanism is actuated.

[0041] The two battery monomer groups can increase the capacity of the battery device. Meanwhile, since the first collection cavity can collect the emissions of the corresponding battery monomer when each pressure relief mechanism is actuated, the liquid in the emissions flowing into the first collection cavity can enter the liquid collection cavity, reducing the phenomenon of the liquid in the first collection cavity flowing back to the area where each battery monomer is located and contacting the pressure relief mechanism, thereby reducing the possibility of short circuit of the pressure relief mechanism caused by contact with the liquid and improving the reliability of the battery device.

[0042] In an optional embodiment, the cross-sectional area of the first collection cavity perpendicular to the first direction is S1, the cross-sectional area of the pressure relief mechanism of one of the battery monomer groups perpendicular to the second direction is S3, the cross-sectional area of the pressure relief mechanism of the other battery monomer group perpendicular to the second direction is S4, and S1>2×max(S3, S4).

[0043] The cross-sectional area S1 of the first collection cavity is greater than twice the cross-sectional area of the pressure relief mechanism of the battery monomer group with the larger cross-sectional area, so that the emissions generated by each pressure relief mechanism when it is in thermal runaway can be smoothly discharged to the first collection cavity.

[0044] In an optional embodiment, each end plate is provided with the second collection cavity and the second air hole.

[0045] The cross-sectional area of the second air hole of one of the end plates perpendicular to the first direction is S2, the cross-sectional area of the second air hole of the other end plate perpendicular to the first direction is S5, the cross-sectional area of the pressure relief mechanism of one of the battery monomer groups perpendicular to the second direction is S3, the cross-sectional area of the pressure relief mechanism of the other battery monomer group perpendicular to the second direction is S4, S2>2max(S3, S4), and S5>2×max(S3, S4).

[0046] By making the cross-sectional area S2 of the second vent hole of one of the end plates larger than the larger one of the cross-sectional areas of the pressure relief mechanisms in the two battery cell groups, the emissions in the first collection cavity can be smoothly discharged to the second collection cavity of the one end plate. By making the cross-sectional area S5 of the second vent hole of the other end plate larger than the larger one of the cross-sectional areas of the pressure relief mechanisms in the two battery cell groups, the emissions in the first collection cavity can be smoothly discharged to the second collection cavity of the other end plate.

[0047] In a second aspect, the present application provides an energy storage device, comprising the battery device in the above embodiments.

[0048] According to the energy storage device provided by the present application, since the battery device in any one of the first aspect embodiments is included, the technical effects of any one of the above embodiments are achieved, which will not be repeated here.

[0049] In a third aspect, the present application provides an energy storage system, comprising an energy storage converter and the energy storage device in the above embodiments, the energy storage converter being used to electrically connect a power generation device and the energy storage device.

[0050] According to the energy storage system provided by the present application, since the energy storage device in any one of the second aspect embodiments is included, the technical effects of any one of the above embodiments are achieved, which will not be repeated here.

[0051] In a fourth aspect, the present application provides a charging network, comprising a charging pile and the energy storage device in the above embodiments, the energy storage device being used to provide electric energy for the charging pile.

[0052] According to the charging network provided by the present application, since the energy storage device in any one of the second aspect embodiments is included, the technical effects of any one of the above embodiments are achieved, which will not be repeated here.

[0053] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, and to be implemented according to the content of the description, and in order to enable other purposes, features and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0054] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are intended to depict only preferred embodiments of the application, and therefore should not be considered to narrow the scope of the present application in any way. Rather, the scope of the application is to be determined solely by the appended claims. Furthermore, the drawings are not to scale and are shown for purposes of explanation only. In the drawings:

[0055] Figure 1 Structure schematic diagram of a charging network in some embodiments of the present application;

[0056] Figure 2 Structure diagram of a battery device in some embodiments of the present application;

[0057] Figure 3 Structure diagram of a battery device in some embodiments of the present application;

[0058] Figure 4 Structure diagram of a battery device in some embodiments of the present application;

[0059] Figure 5 Structure diagram of a battery device in some embodiments of the present application;

[0060] Figure 6 Structure diagram of a battery device in some embodiments of the present application;

[0061] Figure 7 Assembly diagram of a support beam, two end plates, a reinforcing member and a bottom plate in some embodiments of the present application; Figure 5

[0062] Sectional view of A-A in some embodiments of the present application; Figure 8 Figure 7 Enlarged diagram of C in some embodiments of the present application;

[0063] Figure 9 Figure 8 Enlarged diagram of B in some embodiments of the present application.

[0064] Figure 10 Enlarged diagram of B in some embodiments of the present application. Figure 8

[0065] Reference numerals in the detailed description of the embodiments are as follows:

[0066] 1000, charging network; 2000, energy storage system; 3000, power generation device;

[0067] 100, battery device;

[0068] 10, box body; 11, first part; 12, second part; 13, end plate; 13a, first end plate; 13b, second end plate; 131, second collecting cavity; 1311, first sub-cavity; 1312, second sub-cavity; 132, second air hole; 133, partition plate; 15, bottom plate; 16, reinforcing member; 16a, first reinforcing member; 16b, second reinforcing member;

[0069] 20, battery cell group; 20a, first battery cell group; 20b, second battery cell group; 21, battery cell; 211, shell; 2111, end cap; 2112, housing; 212, electrode assembly; 213, pole;

[0070] ​​​40, support beam; 41, first collecting cavity; 411, first inner surface; 412, second inner surface; 42, liquid collecting cavity; 43, partition plate; 431, liquid discharging hole; 44, first vent hole; 46, cross plate; 461, via hole;

[0071] 200, energy storage device; 210, energy storage box;

[0072] 300, charging pile;

[0073] 400, energy storage converter;

[0074] x, first direction; y, second direction; z, third direction. DETAILED DESCRIPTION

[0075] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0076] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0077] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more (including two), "multiple groups" means two groups or more (including two groups), and "multiple pieces" means two pieces or more (including two pieces).

[0078] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily mutually exclusive or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0079] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity.

[0080] In some embodiments, a battery cell group is generally formed by a plurality of battery cells arranged in series, parallel or mixed connection by busbar components. As an example, the battery cell group can be a battery module, which is formed by a plurality of battery cells arranged and fixed into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells by a cable tie.

[0081] In a battery device with double-row battery cells, the battery cells in the same row form a battery cell group. In order to ensure the safety of the battery device, a metal support beam with an exhaust channel is usually arranged between the two battery cell groups. The two battery cell groups are distributed on both sides of the support beam, and the pressure relief mechanism of each battery cell is located on the side of each battery cell close to the support beam, i.e., the pressure relief mechanisms of the two rows of battery cells are located on both sides of the support beam face to face. The support beam is internally provided with a collection cavity, and the positions on the support beam opposite to each pressure relief mechanism are respectively designed with a plurality of dense small holes (the size of each dense small hole is smaller than the size of the pressure relief mechanism). When the battery cell is in thermal runaway, the exhaust (such as high-temperature and high-pressure gas, liquid and metal solid substance) can be ejected from the pressure relief mechanism, then enter the collection cavity through the dense small hole, and finally be discharged to the outside of the battery device through the hollow channel of the end plate of the battery device.

[0082] However, when one of the battery cells in the same battery cell group occurs thermal runaway and valve ejection, since the size of the dense small hole is smaller than the size of the pressure relief mechanism, the ejected exhaust is blocked by the adjacent dense small hole. The exhaust generated during thermal runaway is difficult to be smoothly discharged through the dense small hole, resulting in that part of the exhaust enters the area of the adjacent battery cell, which is easy to cause thermal runaway diffusion, or cause short circuit between the shell of the adjacent battery cell and the support beam.

[0083] In addition, during the operation of the battery pack, condensate water is generated in the support beam or the end plate, and when the battery cell is in thermal runaway, the electric box releases electrolyte. If the condensate water and electrolyte (hereinafter referred to as "liquid") accumulate too much, more liquid will flow back to the area of the battery cell through the dense small hole and contact the explosion-proof valve, resulting in short circuit of the explosion-proof valve.

[0084] In order to reduce the possibility of liquid flowing back to the area of the battery cell and contacting the explosion-proof valve, it is found through research that a liquid collecting cavity capable of communicating with the collection cavity can be arranged in the support beam. When the battery cell is in thermal runaway, the liquid in the exhaust generated by the battery cell can enter the liquid collecting cavity after being discharged to the collection cavity, so as to reduce the liquid in the collection cavity and reduce the possibility of liquid flowing back, thereby improving the reliability of the battery device.

[0085] Based on the above considerations, in order to solve the problem that the liquid in the exhaust released when the battery monomer occurs thermal runaway is easy to backflow, causing the short circuit of the explosion-proof valve, a battery device is designed, a liquid collecting cavity capable of communicating with the first collecting cavity is arranged in the support beam, so as to collect the liquid in the exhaust in the first collecting cavity through the liquid collecting cavity, reduce the phenomenon that the liquid flows back to the area where the battery monomer is located and contacts the pressure relief mechanism, and then the possibility of short circuit of the pressure relief mechanism due to contact with the liquid can be reduced, and the reliability of the battery device can be improved.

[0086] The battery device disclosed by the embodiments of the application can be applied to an energy storage container or an energy storage cabinet and the like.

[0087] The battery device 100 will be described below in combination with the accompanying drawings.

[0088] Please refer to Figure 1 and Figure 3 , Figure 1 the structural schematic diagram of the charging network 1000 provided by some embodiments of the application, Figure 3 the structural schematic diagram of the energy storage device 200 provided by some embodiments of the application. The charging network 1000 provided by the embodiments of the application includes a charging pile 300, and the charging pile 300 is used to charge an electric device. The charging network 1000 can also include an energy storage device 200, and the energy storage device 200 is electrically connected with the charging pile 300, and the energy storage device 200 is used to provide electric energy for the charging pile 300.

[0089] It should be noted that the charging pile 300 and the battery monomer in the energy storage device 200 are electrically connected through a cable, and the battery monomer can provide the electric energy stored by itself to the charging pile 300. The charging pile 300 has a connector, and the connector can be connected with the electric device, so that the electric device can be charged. The charging network 1000 applies the energy storage device 200, which can effectively improve the safety of the charging network 1000, and also helps to improve the flexibility of the charging network 1000 when deployed.

[0090] In one charging network 1000, the charging pile 300 can be one, and the energy storage device 200 provides electric energy for one charging pile 300; the charging pile 300 can also be multiple, and the energy storage device 200 provides electric energy for multiple charging piles 300.

[0091] As an example, as shown in Figure 1 , the charging network 1000 includes one energy storage device 200 and two charging piles 300, and one energy storage device 200 provides electric energy for two charging piles 300.

[0092] The energy storage device 200 can include the battery device 100, and the battery device 100 is electrically connected with the charging pile 300, so as to provide the charging pile 300 with electric energy.

[0093] Please refer to Figure 2 and Figure 3 , Figure 2 The structure diagram of the energy storage system 2000 provided by some embodiments of the present application is shown. The embodiments of the present application provide an energy storage system 2000. The energy storage system 2000 includes an energy storage converter 400, and the energy storage converter 400 can be electrically connected with a power generation device 3000, so as to convert the electric power provided by the power generation device 3000. The energy storage system 2000 can also include an energy storage device 200, and the energy storage device 200 is electrically connected with the energy storage converter 400, and the energy storage converter 400 guides the electric energy provided by the power generation device 3000 to the energy storage device 200 after power conversion for storage.

[0094] The power conversion device is used to connect between the power generation device 3000 and the energy storage device 200. The power generation device 3000 is used to generate electric energy, and the power generation device 3000 is used to store the electric energy generated by the power generation device 3000 to the energy storage device 200 through the power conversion device. The energy storage system 2000 applies the energy storage device 200, and the operation safety of the energy storage system 2000 can be effectively improved. In specific implementation, the power generation equipment can be a solar panel, a hydroelectric power generation equipment, a thermal power generation equipment, etc. The specific type of the power generation equipment is not limited in the present application.

[0095] As an example, as shown in Figure 2 , the energy storage system 2000 includes the energy storage device 200 and the energy storage converter 400, and two power generation devices 3000 respectively transmit the generated electric energy to the energy storage converter 400, and the electric energy is guided to the energy storage device 200 through the energy storage converter 400 for storage.

[0096] Please refer to Figure 3 , the energy storage device 200 includes an energy storage box 210, and the energy storage box 210 is provided with a battery device 100.

[0097] As an example, the energy storage device 200 can be an energy storage container, an energy storage cabinet, etc.

[0098] As an example, the energy storage device 200 can be used in an energy storage power station, a wind power system, a solar power system, a mobile power system, or a temporary power supply system, etc. The energy storage power station can store electric energy during the low electricity consumption period, and provide electric energy for relevant users or electric equipment during the peak electricity consumption period. The wind power generator set of the wind power system converts wind energy into electric energy, which is stored by the energy storage device 200. The solar power system converts solar energy into electric energy, which is stored by the energy storage device 200 and supplied to users in time. The mobile power system can supply power to relevant electric equipment in places where the power grid supply system cannot reach, such as remote mountainous areas and remote wild areas. The temporary power supply system can supply power to users in the case of insufficient power supply.

[0099] According to some embodiments of the present application, referring to Figures 4 to 8 , Figure 4 is a schematic diagram of an exploded structure of the battery device 100 in some embodiments of the present application, Figure 5 is a schematic diagram of another structure of the battery device 100 in some embodiments of the present application, Figure 6 is a schematic diagram of an exploded structure of the battery cell 21 in some embodiments of the present application, Figure 7 is Figure 5 is an assembly schematic diagram of the support beam 40, the two end plates 13, the reinforcing member 16 and the bottom plate 15 in Figure 8 is Figure 7 is a sectional view at A-A in Figure 9 is Figure 8 is an enlarged schematic diagram at C in Figure 10 is Figure 8 is an enlarged schematic diagram at B in

[0100] The present application provides a battery device 100, which comprises a battery cell group 20 and a support beam 40. The battery cell group 20 comprises a plurality of battery cells 21 arranged along a first direction x. The support beam 40 is arranged on one side of the battery cell group 20 along a second direction y, and the second direction y intersects the first direction x.

[0101] The side of the battery cell 21 facing the support beam 40 is provided with a pressure relief mechanism (not shown in the figure). The inside of the support beam 40 is provided with a first collection cavity 41 and a liquid collection cavity 42. The first collection cavity 41 is used to collect the discharge of the battery cell 21 when the pressure relief mechanism is actuated. The liquid collection cavity 42 is in communication with the first collection cavity 41, and the liquid collection cavity 42 is used to collect the liquid in the discharge.

[0102] The battery cell group 20 is an assembly composed of a plurality of battery cells 21 in series, parallel or mixed connection.

[0103] Exemplarily, referring to Figure 6The battery cell 21 further comprises a housing 211, an electrode assembly 212, and other functional components.

[0104] The housing 211 comprises an end cap 2111 and a shell 2112. The end cap 2111 is a component that covers the opening of the shell 2112 to isolate the internal environment of the battery cell from the external environment. Without limitation, the shape of the end cap 2111 can be adapted to the shape of the shell 2112 to fit the shell 2112. Optionally, the end cap 2111 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cap 2111 is less likely to deform when subjected to extrusion and collision, and the battery cell 21 can have higher structural strength and improved safety performance. The end cap 2111 can be provided with functional components such as a pole 213. The pole 213 can be used to electrically connect with the electrode assembly 212 for outputting or inputting the electric energy of the battery cell 21. Exemplarily, the pole 213 of the battery cell 21 and the pressure relief mechanism are arranged opposite to each other along the second direction y, i.e., the pole 213 of the battery cell 21 is arranged on the side of the battery cell 21 opposite to the support beam 40.

[0105] In some embodiments, the end cap 2111 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 21 when the internal pressure or temperature of the battery cell 21 reaches a threshold value. The material of the end cap 2111 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon. In some embodiments, an insulating member can also be arranged on the inner side of the end cap 2111. The insulating member can be used to isolate the electrical connection components in the shell 2112 from the end cap 2111 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0106] The shell 2112 is a component used to fit the end cap 2111 to form the internal environment of the battery cell 21, wherein the formed internal environment can be used to accommodate the electrode assembly 212, the electrolyte, and other components. The shell 2112 and the end cap 2111 can be independent components, and an opening can be provided on the shell 2112. The end cap 2111 is made to cover the opening to form the internal environment of the battery cell 21. Without limitation, the end cap 2111 and the shell 2112 can also be integrated. Specifically, the end cap 2111 and the shell 2112 can first form a common connecting surface before other components enter the shell, and then the end cap 2111 is made to cover the shell 2112 when it is necessary to seal the inside of the shell 2112. The shell 2112 can be various shapes and sizes, such as rectangular, cylindrical, hexagonal, etc. Specifically, the shape of the shell 2112 can be determined according to the specific shape and size of the electrode assembly 212. The material of the shell 2112 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon.

[0107] The electrode assembly 212 is a component in which electrochemical reactions occur in the battery cell 21. One or more electrode assemblies 212 can be contained within the housing 2112. The electrode assembly 212 is mainly formed by winding or layering a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet each have a portion with an active material constituting a main body of the electrode assembly 212, and a portion without the active material constituting a tab. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or at opposite ends of the main body. During charging and discharging of the battery device 100, the positive electrode active material and the negative electrode active material react with an electrolyte, and the tabs are connected to the terminal post 213 to form a current loop.

[0108] The first direction x and the second direction y are two horizontal directions perpendicular to each other. For example, the first direction x can be parallel to the width direction of the battery device 100, and the second direction y can be parallel to the length direction of the battery device 100; or the first direction x can be parallel to the length direction of the battery device 100, and the second direction y can be parallel to the width direction of the battery device 100.

[0109] The pressure relief mechanism refers to an element or component that is actuated to release internal pressure or temperature when the internal pressure or temperature or other conditions of the battery cell 21 reaches a predetermined threshold. The threshold is designed differently according to different design requirements. The threshold can depend on the material of one or more of the positive electrode sheet, the negative electrode sheet, the electrolyte, and the separator in the battery cell. The pressure relief mechanism can take the form of, for example, a rupture disc, a gas valve, a pressure relief valve, or a safety valve, and can specifically take the form of a pressure-sensitive or temperature-sensitive element or structure, i.e., when the internal pressure or temperature or other conditions of the battery cell reaches a predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is broken, thereby forming an opening or passage for the internal pressure or temperature to be released.

[0110] The pressure relief mechanism can be a rupture disc, specifically a rupture disc.

[0111] In the technical solution of the present application, the liquid collection chamber 42 capable of communicating with the first collection chamber 41 is arranged inside the support beam 40 to collect the liquid in the discharge from the first collection chamber 41, thereby reducing the phenomenon of the liquid in the first collection chamber 41 flowing back to the area where the battery cell 21 is located and contacting the pressure relief mechanism, and further reducing the possibility of short circuit of the pressure relief mechanism due to contact with the liquid, thereby improving the reliability of the battery device 100.

[0112] According to some embodiments of the present application, with reference to Figure 8 The first collection chamber 41 and the liquid collection chamber 42 are arranged apart along the third direction z, and the third direction z, the second direction y, and the first direction x intersect with each other.

[0113] Exemplarily, the third direction z, the second direction y and the first direction x are perpendicular to each other, and the second direction y and the first direction x are parallel to the length direction and the width direction of the battery device 100 respectively, the third direction z will be parallel to the height direction of the battery device 100.

[0114] By spacing the first collection cavity 41 and the liquid collection cavity 42 along the third direction z, the liquid collection cavity 42 can collect the liquid in the first collection cavity 41 along the third direction z intersecting the second direction y and the first direction x.

[0115] According to some embodiments of the present application, referring to Figure 5 and Figure 8 , the third direction z is parallel to the height direction of the battery device 100, and the first collection cavity 41 is located above the liquid collection cavity 42.

[0116] The third direction z is configured to be parallel to the height direction of the battery device 100, at this time, the first collection cavity 41 is located above the liquid collection cavity 42, so that the liquid can flow downward under the action of gravity and enter the liquid collection cavity 42.

[0117] According to some embodiments of the present application, referring to Figures 8 to 10 , the support beam 40 is internally provided with a partition plate 43, the first collection cavity 41 and the liquid collection cavity 42 are located on both sides of the partition plate 43 respectively, the partition plate 43 is provided with a liquid discharge hole 431, and the liquid collection cavity 42 communicates with the first collection cavity 41 through the liquid discharge hole 431.

[0118] Exemplarily, the partition plate 43 can be integrally formed in the support beam 40, so as to improve the integration of the support beam 40 and simplify the structure of the battery device 100.

[0119] Exemplarily, the support beam 40 can be integrally formed by pouring, at this time, in order to form the liquid discharge hole 431 on the partition plate 43 in the support beam 40, a drilling device can pass through the support beam 40 at a position corresponding to the partition plate 43 along the third direction z until the drilling device can form the liquid discharge hole 431 on the partition plate 43. Figures 8 to 10 For example, the support beam 40 has two horizontal plates 46 above the partition plate 43 along the third direction z, so that the drilling device can first pass through the two horizontal plates 46 above the partition plate 43 along the third direction z, and then form the liquid discharge hole 431 on the partition plate 43, at this time, the horizontal plates 46 will form a via hole 461.

[0120] The partition plate 43 is arranged in the support beam 40 to divide the inner cavity of the support beam 40 into the first collection cavity 41 and the liquid collection cavity 42 through the partition plate 43. Meanwhile, the liquid in the first collection cavity 41 can flow into the liquid collection cavity 42 through the liquid discharge hole 431 arranged on the partition plate 43 and communicated with the first collection cavity 41.

[0121] According to some embodiments of the present application, referring to Figures 4 to 8 , the extension direction of the liquid discharge hole 431 is parallel to the third direction z.

[0122] By making the extension direction of the liquid discharge hole 431 parallel to the third direction z, the liquid can flow into the liquid collection cavity 42 along the third direction z, and at this time, the flow path of the liquid is the shortest.

[0123] According to some embodiments of the present application, Figures 8 to 10 , the cross section of the liquid discharge hole 431 perpendicular to the third direction z is circular, and the diameter of the liquid discharge hole 431 is not less than 10 mm, such as 12 mm, 13 mm, 15 mm, 18 mm, etc.

[0124] By making the diameter of the liquid discharge hole 431 not less than 10 mm, the liquid can quickly enter the liquid collection cavity 42, avoiding the influence of the small diameter of the liquid discharge hole 431 on the flow rate of the liquid.

[0125] According to some embodiments of the present application, referring to Figure 8 , the liquid discharge hole 431 is provided with a plurality of liquid discharge holes 431, and the plurality of liquid discharge holes 431 are sequentially and spaced apart along the first direction x.

[0126] The distance between the centers of two adjacent liquid discharge holes 431 is d1, and the size of the battery monomer 21 along the first direction x is d2, and d1≤2×d2.

[0127] Since the distance d1 between the centers of two adjacent liquid discharge holes 431 is not more than 2 times the size d2 of the battery monomer 21 along the first direction x, at least two liquid discharge holes 431 are arranged between every three adjacent battery monomers 21, so that the liquid can quickly enter the liquid collection cavity 42, avoiding the influence of the small diameter of the liquid discharge hole 431 on the flow rate of the liquid.

[0128] According to some embodiments of the present application, referring to Figures 4 to 8 , the side of the support beam 40 facing the battery monomer 21 is provided with a first vent hole 44 communicated with the first collection cavity 41, and the first vent hole 44 corresponds to the position of the pressure relief mechanism.

[0129] In the first projection plane perpendicular to the second direction y, the orthographic projection of the first vent hole 44 covers the orthographic projection of the pressure relief mechanism. Exemplarily, the shape of the first vent hole 44 can be matched with the shape of the pressure relief mechanism, and the cross-sectional area of the first vent hole 44 is not less than the cross-sectional area of the pressure relief mechanism, so that the orthographic projection of the first vent hole 44 can cover the orthographic projection of the pressure relief mechanism.

[0130] By arranging the first vent hole 44 on the side of the support beam 40 facing the battery monomer 21, when the pressure relief mechanism is actuated, the exhaust of the battery monomer 21 can be directly discharged from the first vent hole 44 to the first collection cavity 41. At the same time, since the orthographic projection of the first vent hole 44 in the first projection plane covers the orthographic projection of the pressure relief mechanism in the first projection plane, on the one hand, the pressure relief mechanism can be unobstructed, which is conducive to the rapid opening of the pressure relief mechanism, avoiding the pressure relief mechanism being unable to open or being unable to fully open due to being blocked by the support beam 40 when the pressure relief mechanism is actuated, thereby avoiding the battery monomer 21 being unable to exhaust or exhausting not smoothly when the battery monomer 21 is in thermal runaway, preventing the internal pressure of the battery monomer 21 from being unable to be quickly released, causing the shell 211 of the battery monomer 21 to rupture or explode. On the other hand, it can also avoid the metal structure of the pressure relief mechanism being in contact with the shell 211 of the battery monomer 21 and the support beam 40 at the same time when the pressure relief mechanism is actuated.

[0131] According to some embodiments of the present application, referring to Figures 8 to 10 , the cross-sectional area of the first collection cavity 41 perpendicular to the first direction x is S1, and the cross-sectional area of the pressure relief mechanism perpendicular to the second direction y is S3, S1>2×S3.

[0132] By making the cross-sectional area S1 of the first collection cavity 41 greater than 2 times the cross-sectional area S3 of the pressure relief mechanism, the exhaust generated when the pressure relief mechanism is in thermal runaway can be smoothly discharged to the first collection cavity 41.

[0133] According to some embodiments of the present application, referring to Figure 4 , the battery device 100 further comprises a box 10, the box 10 is used to provide a containing space for the battery monomer 21, and the box 10 can adopt various structures.

[0134] Exemplarily, referring to Figure 4 , the box 10 can comprise a first part 11 and a second part 12, the first part 11 and the second part 12 are mutually covered, and the first part 11 and the second part 12 jointly define a containing space for containing the battery monomer 21. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-shaped structure, the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define the containing space; the first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12.

[0135] Of course, the box 10 formed by the first part 11 and the second part 12 can be in various shapes, such as a cylinder, a cuboid, etc. Exemplarily, in the embodiment shown in Figure 4 , the box 10 is in the shape of a cuboid.

[0136] In the battery device 100, the plurality of battery cells 21 can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the plurality of battery cells 21 are connected in series and in parallel. The plurality of battery cells 21 can be directly connected in series, in parallel, or in a mixed manner, and the whole of the plurality of battery cells 21 is accommodated in the box 10. Of course, the battery device 100 can also be in the form of a battery device module in which the plurality of battery cells 21 are connected in series, in parallel, or in a mixed manner, and a plurality of battery device modules are connected in series, in parallel, or in a mixed manner to form a whole, which is accommodated in the box 10. The battery device 100 can further include other structures, for example, the battery device 100 can further include a current collecting member for realizing electrical connection between the plurality of battery cells 21.

[0137] Each of the plurality of battery cells 21 can be a secondary battery device, which means that the battery cell can be activated by charging after being discharged to continue to be used.

[0138] According to some embodiments of the present application, with reference to Figures 7 to 10 , the box 10 includes two end plates 13 spaced apart along the first direction x, for the convenience of description, the two end plates 13 are respectively marked as a first end plate 13a and a second end plate 13b, and the support beam 40 is connected between the first end plate 13a and the second end plate 13b, and the battery cell group 20 is arranged between the first end plate 13a and the second end plate 13b.

[0139] At least one of the first end plate 13a and the second end plate 13b is provided with a second collection cavity 131 and a second vent hole 132 communicating with the second collection cavity 131.

[0140] The first collection cavity 41 communicates with the second collection cavity 131 through the second vent hole 132.

[0141] Since the first collection cavity 41 can communicate with the second collection cavity 131, the exhaust of the battery cell 21 can enter the second collection cavity 131 through the first collection cavity 41 and the second vent hole 132.

[0142] According to some embodiments of the present application, with reference to Figure 8 and Figure 10 , the cross-sectional area of the second vent hole 132 perpendicular to the first direction x is S2, the cross-sectional area of the pressure relief mechanism perpendicular to the second direction y is S3, and S2>2×S3.

[0143] By making the cross-sectional area S2 of the second vent hole 132 greater than 2 times the cross-sectional area S3 of the pressure relief mechanism, the emissions in the first collection cavity 41 can be smoothly discharged to the second collection cavity 131 through the second vent hole 132.

[0144] According to some embodiments of the present application, with reference to Figure 10 , the second collection cavity 131 is provided with a partition plate 133, the partition plate 133 is used to separate the second collection cavity 131 into a first sub-cavity 1311 and a second sub-cavity 1312, the first sub-cavity 1311 and the second sub-cavity 1312 are spaced apart along the third direction z.

[0145] The first sub-cavity 1311 and the second sub-cavity 1312 are both communicated with the second vent hole 132.

[0146] Since the second collection cavity 131 is provided with the partition plate 133, the inner cavity of the second collection cavity 131 can be separated by the partition plate 133 to form the first sub-cavity 1311 and the second sub-cavity 1312 which are spaced apart along the third direction z, and the first sub-cavity 1311 and the second sub-cavity 1312 can be communicated with the first collection cavity 41 through the second vent hole 132, at this time, the liquid in the emissions in the first collection cavity 41 can enter the one with lower position between the first sub-cavity 1311 and the second sub-cavity 1312, and the liquid is discharged from the end plate 13. For example, with reference to Figure 10 , the first sub-cavity 1311 is located above the second sub-cavity 1312 along the third direction z, at this time, the liquid in the emissions in the first collection cavity 41 can enter the second sub-cavity 1312 with lower position.

[0147] According to some embodiments of the present application, with reference to Figure 10 , the first collection cavity 41 has a first inner surface 411 and a second inner surface 412 which are oppositely arranged along the third direction z.

[0148] The partition plate 133 is located between the first inner surface 411 and the second inner surface 412 along the third direction z, and is spaced apart from the first inner surface 411 and the second inner surface 412.

[0149] Since the partition plate 133 is located between the first inner surface 411 and the second inner surface 412 of the first collection cavity 41 along the third direction z, and the partition plate 133 is spaced apart from the first inner surface 411 and the second inner surface 412, at this time, the emissions in the first collection cavity 41 can be smoothly discharged to the one with lower position between the first sub-cavity 1311 and the second sub-cavity 1312 through the second vent hole 132, and the resistance of the partition plate 133 to the flow of liquid is reduced.

[0150] According to some embodiments of the present application, with reference to Figure 5 , Figures 7 to 8The box body 10 further comprises a bottom plate 15 for bearing the battery cell group 20, and a reinforcing member 16.

[0151] The reinforcing member 16 is connected between the two end plates 13, and the battery cell group 20 is positioned between the reinforcing member 16 and the bottom plate 15 along the third direction z.

[0152] Exemplarily, the reinforcing member 16 can be selected as a steel pressing strip.

[0153] By arranging the bottom plate 15, the mounting of the support beam 40 and the two end plates 13 is achieved. Meanwhile, by arranging the reinforcing member 16, the battery cell group 20 is positioned along the third direction z through the cooperation among the reinforcing member 16, the two end plates 13 and the bottom plate 15, so as to reduce the possibility of the battery cells 21 being taken out along the third direction z, and also to relieve the expansion force of the battery cells 21 while enhancing the structural strength of the reinforcing box body 10.

[0154] According to some embodiments of the present application, referring to Figure 5 The battery cell group 20 is arranged in two, and the two battery cell groups 20 are respectively arranged on opposite sides of the support beam 40 along the second direction y. Each battery cell group 20 comprises a plurality of battery cells 21 arranged along the first direction x, and the side of the battery cells 21 of each battery cell group 20 facing the support beam 40 is provided with a pressure relief mechanism.

[0155] For the convenience of description, the two battery cell groups 20 are respectively marked as a first battery cell group 20a and a second battery cell group 20b. The pressure relief mechanism of the battery cells 21 of the first battery cell group 20a is a first pressure relief mechanism, the pressure relief mechanism of the battery cells 21 of the second battery cell group 20b is a second pressure relief mechanism, and the first collecting cavity 41 is used for collecting the discharge of the battery cells 21 of the first battery cell group 20a when the first pressure relief mechanism is actuated, and also for collecting the discharge of the battery cells 21 of the second battery cell group 20b when the second pressure relief mechanism is actuated.

[0156] Exemplarily, the two battery cell groups 20 are symmetrically arranged about the support beam 40 along the second direction y, and the battery cells 21 of the first battery cell group 20a are identical in structure to the battery cells 21 of the second battery cell group 20b.

[0157] By arranging two battery monomer groups 20, the capacity of the battery device 100 can be increased. Meanwhile, since the first collecting cavity 41 can collect the emissions of the battery monomers 21 of the first battery monomer group 20a when the first pressure relief mechanism is actuated, and can collect the emissions of the battery monomers 21 of the second battery monomer group 20b when the second pressure relief mechanism is actuated, the liquid in the emissions flowing into the first collecting cavity 41 can enter the liquid collecting cavity 42, reducing the phenomenon of the liquid in the first collecting cavity 41 flowing back to the area where the battery monomers 21 are located and contacting the pressure relief mechanism, and further reducing the possibility of the pressure relief mechanism being short-circuited due to contact with the liquid, thereby improving the reliability of the battery device 100.

[0158] According to some embodiments of the present application, with reference to Figures 8 to 10 , the cross-sectional area of the first collecting cavity 41 perpendicular to the first direction x is S1, the cross-sectional area of the pressure relief mechanism of one of the battery monomer groups 20 perpendicular to the second direction y is S3, and the cross-sectional area of the pressure relief mechanism of the other battery monomer group 20 perpendicular to the second direction y is S4, S1>2×max(S3, S4).

[0159] Exemplarily, one of the battery monomer groups 20 is the first battery monomer group 20a, and the other battery monomer group 20 is the second battery monomer group 20b. At this time, if the battery monomers 21 of the first battery monomer group 20a and the battery monomers 21 of the second battery monomer group 20b are completely the same in structure, the size of the first pressure relief mechanism is the same as that of the second pressure relief mechanism, and the cross-sectional area S3 of the first pressure relief mechanism perpendicular to the second direction y will be the same as the cross-sectional area S4 of the second pressure relief mechanism perpendicular to the second direction y. If the size of the first pressure relief mechanism of the battery monomers 21 of the first battery monomer group 20a is different from the size of the second pressure relief mechanism of the battery monomers 21 of the second battery monomer group 20b, the cross-sectional area S3 of the first pressure relief mechanism perpendicular to the second direction y will be greater than or less than the cross-sectional area S4 of the second pressure relief mechanism perpendicular to the second direction y.

[0160] By making the cross-sectional area S1 of the first collecting cavity 41 greater than twice the cross-sectional area of the pressure relief mechanism of the two battery monomer groups 20, the emissions generated when each pressure relief mechanism is in thermal runaway can be smoothly discharged to the first collecting cavity 41.

[0161] According to some embodiments of the present application, with reference to Figures 8 to 10 Each of the end plates 13 is provided with a second collecting cavity 131 and a second vent hole 132.

[0162] At this time, the cross-sectional area of the second vent hole 132 of one of the end plates 13 perpendicular to the first direction x is S2, the cross-sectional area of the second vent hole 132 of the other end plate 13 perpendicular to the first direction x is S5, the cross-sectional area of the pressure relief mechanism of one of the battery cell groups 20 perpendicular to the second direction y is S3, the cross-sectional area of the pressure relief mechanism of the other battery cell group 20 perpendicular to the second direction y is S4, S2>2max(S3, S4), and S5>2max(S3, S4).

[0163] Exemplarily, one of the end plates 13 is a first end plate 13a, the other end plate 13 is a second end plate 13b, one of the battery cell groups 20 is a first battery cell group 20a, and the other battery cell group 20 is a second battery cell group 20b.

[0164] By making the cross-sectional area S2 of the second vent hole 132 of the first end plate 13a greater than twice the cross-sectional area of the pressure relief mechanism of the one of the two battery cell groups 20 with the larger cross-sectional area, the exhaust in the first collection cavity 41 can be smoothly discharged to the second collection cavity 131 of the first end plate 13a. By making the cross-sectional area S5 of the second vent hole 132 of the second end plate 13b greater than twice the cross-sectional area of the pressure relief mechanism of the one of the two battery cell groups 20 with the larger cross-sectional area, the exhaust in the first collection cavity 41 is smoothly discharged to the second collection cavity 131 of the second end plate 13b.

[0165] According to some embodiments of the present application, with reference to Figures 8 to 10 , when the battery cell group 20 is provided with two, the reinforcement 16 can be provided with multiple.

[0166] Each reinforcement 16 is connected between two end plates 13, one of the battery cell groups 20 is limited along the third direction z between part of the reinforcement 16 and the bottom plate 15, and the other battery cell group 20 is limited along the third direction z between the remaining reinforcement 16 and the bottom plate 15.

[0167] Exemplarily, one of the battery cell groups 20 is a first battery cell group 20a, the other battery cell group 20 is a second battery cell group 20b, the reinforcement 16 includes at least a first reinforcement 16a and a second reinforcement 16b, the first battery cell group 20a is limited along the third direction z between the first reinforcement 16a and the bottom plate 15, and the second battery cell group 20b is limited along the third direction z between the second reinforcement 16b and the bottom plate 15.

[0168] By arranging the plurality of reinforcing members 16, the plurality of reinforcing members 16, the two end plates 13 and the bottom plate 15 are cooperated to limit the battery cell groups 20 along the third direction z, so as to reduce the possibility of the battery cells 21 being taken out along the third direction z, and also to relieve the expansion force of the battery cells 21 while enhancing the structural strength of the box body 10.

[0169] According to some embodiments of the present application, referring to Figure 3 , the present application also provides a battery device 100 according to any one of the above schemes.

[0170] According to some embodiments of the present application, referring to Figure 2 , the present application also provides an energy storage system 2000, which comprises an energy storage inverter device 400 and an energy storage device 200 according to any one of the above schemes, and the energy storage inverter device 400 is used to electrically connect a power generation device 3000 and the energy storage device 200.

[0171] According to some embodiments of the present application, referring to Figure 1 , the present application also provides a charging network 1000, which comprises a charging pile 300 and an energy storage device 200 according to any one of the above schemes, and the energy storage device 200 is used to provide electric energy for the charging pile 300.

[0172] According to some embodiments of the present application, referring to Figure 5 , Figures 7 to 10 The present application provides a battery device 100, which comprises a box body 10, two battery cell groups 20 and a support beam 40, the box body 10 comprises two end plates 13, a bottom plate 15 and two reinforcing members 16, the bottom plate 15 is used to carry the battery cell groups 20, and the support beam 40 and the two end plates 13 are connected to the bottom plate 15.

[0173] The two battery cell groups 20 comprise a first battery cell group 20a and a second battery cell group 20b, the two end plates 13 comprise a first end plate 13a and a second end plate 13b, and the two reinforcing members 16 comprise a first reinforcing member 16a and a second reinforcing member 16b.

[0174] The first reinforcing member 16a and the second reinforcing member 16b are connected between the first end plate 13a and the second end plate 13b respectively, the first battery cell group 20a is limited between the first reinforcing member 16a and the bottom plate 15 along the third direction z, and the second battery cell group 20b is limited between the second reinforcing member 16b and the bottom plate 15 along the third direction z.

[0175] Each battery cell group 20 includes a plurality of battery cells 21 arranged along a first direction x, and each battery cell 21 is provided with a pressure relief mechanism on a side facing the support beam 40. Exemplarily, the pressure relief mechanism of the battery cell 21 of the first battery cell group 20a is a first pressure relief mechanism, and the pressure relief mechanism of the battery cell 21 of the second battery cell group 20b is a second pressure relief mechanism.

[0176] The support beam 40 is arranged between the first battery cell group 20a and the second battery cell group 20b along a second direction y, and the inside of the support beam 40 is provided with a partition plate 43, a first collection cavity 41 and a liquid collection cavity 42 spaced apart along a third direction z, the first collection cavity 41 is located above the liquid collection cavity 42, the first collection cavity 41 and the liquid collection cavity 42 are communicated through a plurality of drainage holes 431 on the partition plate 43, the diameter of the drainage hole 431 is not less than 10mm, the distance between the centers of two adjacent drainage holes 431 is d1, the size of the battery cell 21 along the first direction x is d2, d1≤2×d2.

[0177] The support beam 40 is further provided with a first vent hole 44 corresponding to the position of each pressure relief mechanism, and the first vent hole 44 is communicated with the first collection cavity 41. In a first projection plane perpendicular to the second direction y, the orthographic projection of the first vent hole 44 covers the orthographic projection of the pressure relief mechanism.

[0178] Each end plate 13 is provided with a second collection cavity 131 and a second vent hole 132 communicated with the second collection cavity 131, and the first collection cavity 41 is communicated with each second collection cavity 131 through each second vent hole 132.

[0179] The cross-sectional area of the first collection cavity 41 perpendicular to the first direction x is S1, the cross-sectional area of the second vent hole 132 of the first end plate 13a perpendicular to the first direction x is S2, the cross-sectional area of the second vent hole 132 of the second end plate 13b perpendicular to the first direction x is S5, the cross-sectional area of the first pressure relief mechanism perpendicular to the second direction y is S3, the cross-sectional area of the second pressure relief mechanism perpendicular to the second direction y is S4, S1>2×max(S3,S4), S2>2max(S3,S4), S5>2×max(S3,S4).

[0180] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. These modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any way as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: include: a battery cell group, comprising a plurality of battery cells arranged along a first direction; a support beam, arranged on one side of the battery cell group along the second direction; A pressure relief mechanism is provided on a side of the battery cell facing the support beam, and a first collecting chamber and a liquid collecting chamber are provided inside the support beam. The first collecting chamber and the liquid collecting chamber are spaced apart along a third direction, and the third direction and the second direction intersect with the first direction in pairs. The third direction is parallel to the height direction of the battery device, and the first collecting chamber is located above the liquid collecting chamber; The first collecting chamber is used to collect the discharge of the battery cell when the pressure relief mechanism is actuated; the liquid collecting chamber is communicated with the first collecting chamber, and the liquid collecting chamber is used to collect liquid in the discharge.

2. The battery device according to claim 1, wherein: A partition is provided inside the support beam, the first collecting chamber and the liquid collecting chamber are respectively located on both sides of the partition, a drainage hole is provided on the partition, and the liquid collecting chamber is connected with the first collecting chamber through the drainage hole.

3. The battery device according to claim 2, characterized in that The extension direction of the drainage hole is parallel to the third direction; and / or, A cross section of the drainage hole perpendicular to the third direction is circular, and a diameter of the drainage hole is not less than 10 mm.

4. The battery device according to claim 2, wherein: There are a plurality of drainage holes, and the plurality of drainage holes are sequentially spaced apart along the first direction; The distance between the centers of two adjacent drainage holes is d1, the size of the battery cell along the first direction is d2, and d1≤2×d2.

5. The battery device according to any one of claims 1 to 4, characterized in that: A first vent hole communicating with the first collecting chamber is provided on a side of the support beam facing the battery cell, and the first vent hole corresponds to the position of the pressure relief mechanism; In a first projection plane perpendicular to the second direction, the orthographic projection of the first vent hole covers the orthographic projection of the pressure relief mechanism.

6. The battery device according to any one of claims 1 to 4, characterized in that: The cross-sectional area of ​​the first collecting chamber perpendicular to the first direction is S1, the cross-sectional area of ​​the pressure relief mechanism perpendicular to the second direction is S3, and S1>2×S3.

7. The battery device according to any one of claims 1 to 4, characterized in that: The battery device further includes a box body, the box body including two end plates spaced apart along the first direction, the support beam is connected between the two end plates, and the battery cell group is disposed between the two end plates; At least one of the end plates is provided with a second collecting cavity and a second vent hole communicating with the second collecting cavity; The first collecting chamber is communicated with the second collecting chamber through the second vent hole.

8. The battery device according to claim 7, characterized in that The cross-sectional area of ​​the second vent hole perpendicular to the first direction is S2, the cross-sectional area of ​​the pressure relief mechanism perpendicular to the second direction is S3, and S2>2×S3.

9. The battery device according to claim 7, wherein: A partition plate is provided in the second collecting chamber, the partition plate being used to divide the second collecting chamber into a first sub-chamber and a second sub-chamber, the first sub-chamber and the second sub-chamber being spaced apart along a third direction; the third direction and the second direction are perpendicular to the first direction in pairs; The first sub-cavity and the second sub-cavity are both communicated with the second vent hole.

10. The battery device according to claim 9, characterized in that The first collecting chamber has a first inner surface and a second inner surface that are oppositely arranged along the third direction; The partition plate is located between the first inner surface and the second inner surface along the third direction and is spaced apart from the first inner surface and the second inner surface.

11. The battery device according to claim 7, wherein: The box body further includes a bottom plate and a reinforcement member, wherein the bottom plate is used to support the battery cell group, and the support beam and the two end plates are connected to the bottom plate; The reinforcement is connected between the two end plates, and the battery cell group is located between the reinforcement and the bottom plate along the third direction limit; The third direction and the second direction are perpendicular to the first direction.

12. The battery device according to claim 7, wherein: There are two battery cell groups, and the two battery cell groups are respectively arranged on opposite sides of the support beam along the second direction. A pressure relief mechanism is provided on the side of the battery cell of each battery cell group facing the support beam, and the first collection chamber is used to collect emissions corresponding to the battery cell when each pressure relief mechanism is actuated.

13. The battery device according to claim 12, characterized in that The cross-sectional area of ​​the first collecting chamber perpendicular to the first direction is S1, the cross-sectional area of ​​the pressure relief mechanism of one of the battery cell groups perpendicular to the second direction is S3, and the cross-sectional area of ​​the pressure relief mechanism of the other battery cell group perpendicular to the second direction is S4, S1>2×max(S3, S4).

14. The battery device according to claim 12, wherein: Each of the end plates is provided with the second collecting cavity and the second vent hole; The cross-sectional area of ​​the second air vent of one of the end plates perpendicular to the first direction is S2, and the cross-sectional area of ​​the second air vent of the other end plate perpendicular to the first direction is S5. The cross-sectional area of ​​the pressure relief mechanism of one of the battery cell groups perpendicular to the second direction is S3, and the cross-sectional area of ​​the pressure relief mechanism of the other battery cell group perpendicular to the second direction is S4, S2>2max(S3, S4), S5>2×max(S3, S4).

15. An energy storage device, characterized in that: A battery device comprising the battery device according to any one of claims 1 to 14.

16. An energy storage system, characterized in that: It comprises an energy storage and flow conversion device and the energy storage device as claimed in claim 15, wherein the energy storage and flow conversion device is used to electrically connect a power generation device and the energy storage device.

17. A charging network, characterized in that: It comprises a charging pile and an energy storage device as claimed in claim 15, wherein the energy storage device is used to provide electrical energy to the charging pile.

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